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Finding the Fourth Proportional to 2,643.88, 3,965.92 and 889

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Solution

The fourth proportional to 2,643.88, 3,965.92 and 889 is: 1,333.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,643.88 : 3,965.92 = 889 : x
  2. Step 2: Convert to fraction form
    2,643.88/3,965.92 = 889/x
  3. Step 3: Cross multiply
    2,643.88x = 3,965.92 × 889
  4. Step 4: Simplify right side
    2,643.88x = 3,525,702.88
  5. Step 5: Solve for x
    x = 3,525,702.88/2,643.88
  6. Step 6: Final answer
    x = 1,333.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.